mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 20:39:01 +00:00
69 lines
No EOL
2.9 KiB
C#
69 lines
No EOL
2.9 KiB
C#
using System;
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using CPUx86 = Cosmos.Assembler.x86;
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using Cosmos.Assembler;
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namespace Cosmos.IL2CPU.X86.IL
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{
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[Cosmos.IL2CPU.OpCode( ILOpCode.Code.Shl )]
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public class Shl : ILOp
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{
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public Shl( Cosmos.Assembler.Assembler aAsmblr )
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: base( aAsmblr )
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{
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}
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public override void Execute( MethodInfo aMethod, ILOpCode aOpCode )
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{
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.ECX }; // shift amount
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var xStackItem_ShiftAmount = aOpCode.StackPopTypes[0];
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var xStackItem_Value = aOpCode.StackPopTypes[1];
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var xStackItem_Value_Size = SizeOfType(xStackItem_Value);
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#if DOTNETCOMPATIBLE
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if (xStackItem_Value.Size == 4)
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#else
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if (xStackItem_Value_Size <= 4)
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#endif
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{
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new CPUx86.ShiftLeft { DestinationReg = CPUx86.Registers.ESP, Size = 32, DestinationIsIndirect = true, SourceReg = CPUx86.Registers.CL };
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}
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#if DOTNETCOMPATIBLE
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else if (xStackItem_Value.Size == 8)
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#else
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else if (xStackItem_Value_Size <= 8)
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#endif
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{
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string BaseLabel = GetLabel(aMethod, aOpCode) + ".";
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string LowPartIsZero = BaseLabel + "LowPartIsZero";
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string End_Shl = BaseLabel + "End_Shl";
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// [ESP] is low part
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// [ESP + 4] is high part
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// move low part to eax
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new CPUx86.Mov { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.ESP, SourceIsIndirect = true };
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new CPUx86.Compare { DestinationReg = CPUx86.Registers.CL, SourceValue = 32, Size = 8 };
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new CPUx86.ConditionalJump { Condition = CPUx86.ConditionalTestEnum.AboveOrEqual, DestinationLabel = LowPartIsZero };
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// shift higher part
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new CPUx86.ShiftLeftDouble { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, DestinationDisplacement = 4, SourceReg = CPUx86.Registers.EAX, ArgumentReg = CPUx86.Registers.CL };
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// shift lower part
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new CPUx86.ShiftLeft { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, Size = 32, SourceReg = CPUx86.Registers.CL };
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new CPUx86.Jump { DestinationLabel = End_Shl };
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new Label(LowPartIsZero);
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// remove bits >= 32, so that CL max value could be only 31
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new CPUx86.And { DestinationReg = CPUx86.Registers.CL, SourceValue = 0x1f, Size = 8 };
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// shift low part in EAX and move it in high part
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new CPUx86.ShiftLeft { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.CL, Size = 32};
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new CPUx86.Mov { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, DestinationDisplacement = 4, SourceReg = CPUx86.Registers.EAX };
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// replace unknown low part with a zero, if <= 32
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new CPUx86.Mov { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, SourceValue = 0 };
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new Label(End_Shl);
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}
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else
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throw new NotSupportedException("A size bigger 8 not supported at Shl!");
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}
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}
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} |